MBDA says that CAMM is designed for vessels of a corvette size or larger so around 2000t, way too big for 200t so it's unlikely that development would happen.
AFAIK it currently uses the same VLS as the Asters on the Daring class so an option with the same philosophy of the Phalanx system is unlikely as i reckon it'd require much more intergration than Phalanx although that being said IIRC it's replacing Rapier so would that be an option? Bolting on a CAMM air defence system of a similar size to Rapier? (i'm not sure on the size difference between Rapier + its CAMM counterpart)
MBDA says it has the ability to target "small naval surface craft" but thats about it, to me it does seem too small to do any serious damage against ships but against land targets? Could be possible but again, unlikely. AFAIK the RN are happy with Harpoon/Tomahawks for land targets.
The main thing for me is that is an AA missile for relatively large warships, my fear is that trying to make it compatible with so many tasks it wasn't primarily designed for may just turn it into a "jack of all trades, master of none" weapon in comparison to other systems which are available on the market. I reckon MBDAs current track of focusing on creating and developing a dedicated AA missile is the right one as its not just the RN that'll benefit as the Army (and RAF if they replace ASRAAM - which i don't see them doing however) will also benefit.
When CAMM has matured somewhat during service, then i'd advocate trying to create a more GP CAMM missile, a "don't run before you can walk" idea.
Missile systems, defence systems - MBDA missiles
http://www.mbda-systems.com/mediagallery/files/CAMM-family_background.pdf
http://www.mbda-systems.com/mediagallery/files/CAMM_ds.pdf
^ very good info